THIS IS A TEST INSTANCE. ALL YOUR CHANGES WILL BE LOST!!!!
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New Black/White/Yellow List Technologies
We are all familiar with black lists. Black lists are DNS lists that where IP addresses of spammer are looked up. You send a request to the list with the IP and if it is in the blacklist then you bounce the email. Sounds simple enough except for the false positives.
White lists help reduce false positives. If an IP address is white listed then you can just pass it and not look at black lists.
Yellow lists are lists of hosts that send a mix of spam and non-spam. Email services like Yahoo, Gmail, and Hotmail are examples of mixed source servers. These servers should never be either black or white listed. These are servers where the IP address yields no useful information as to whether the message is spam or ham.